If you plan on selling or donating your smartphone and want to make sure all of your data is off of it, make sure you do more than just factory reset through the phone's OS. Security researchers picked up several phones "wiped" this way, and found tons of data.

On their blog, Security software developer Avast! highlighted the ridiculous amount information they managed to gather from just 20 used—and supposedly "wiped"—smartphones. A good deal of the information was personal, and all of it was easily retrieved.

Each of the phones had been reset using the built-in factory reset option, which their users thought wiped their data off of the device. Here's what they were able to grab anyway:

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More than 40,000 photos, including: over 1,500 family photos of children, 750 photos of women in various stages of undress, and 250 selfies of the previous owner's "manhood."